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Washington Systems Center
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The z/OS GRS Resource Serialization Detective: Tools for Monitoring and Debugging Hands-on Lab
Session # 11634
Nat Stevenson III
stevensn@us.ibm.com
Copyright IBM Corporation 2012
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2
The following are trademarks of International Business Machines Corporation.
ACF/VTAM AD/Cycle ADSM Advanced Function Printing AFP AIX* AIX/ESA
AOEXPERT/MVS Automated Operations Expert/MVS CICS/ESA DataHub
DATABASE 2 DataTrade DB2*
DFDSM DFSMS DFSMS/MVS
DFSMdfp DFSMSdss DFSMShsm DFSMSrmm
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All specifications are subject to change without notice.
Enterprise System/4381
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Note: Performance is in Internal Throughput Rate (ITR) ratio based on measurements and projections using standard IBM benchmarks in a controlled
environment. The actual throughput that any user will experience will vary depending upon considerations such as the amount of multiprogramming
in the user's job stream, the I/O configuration, the storage configuration, and the workload processed. Therefore, no assurance can be given that an
individual user will achieve throughput improvements equivalent to the performance ratios stated here.
Actual performance and environmental costs will vary depending on individual customer configurations and conditions.
Note: IBM hardware products are manufactured from new parts, or new and used parts. Regardless, our warranty terms apply.
Trademarks
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Agenda
Agenda
GRS Monitor - Provides current counts of resource names and volume “reserve” counts.
ISGNQRSP - Measures Enqueue Response times.
ISGECJES – Resource Contention Notification Program.
GRS “Display Cmds” – System display of Enqueue/Reserve contention.
Questions?
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4
ƒAPPLICATION : TSO
ƒUSERID – SHARCxx PASSWORD – welcome
ISPF SESSION
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5
Create the sequential “test data sets” and the PDS data set.
ƒGo to ISPF opt 3.2 to allocate “sharcxx.nat.data”.
• First, select data set “sharc28.nat.data” (no cmds), to get the data set attributes.
•Then pf3 out and then allocate “A” the “sharcxx.nat.data” data set.
ƒRepeat the same for creating the “sharcxx.nat.data120”.
• Get the data set attributes from “sharc28.nat.data120”.
LAB SETUP
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Create the PDS data set containing the JCL…..
ƒRepeat the same for the PDS data set “sharcxx.nat.jcl”.
• Select “sharc28.nat.jcl” to pick up the data set attributes.
• Verify that the “directory blocks” field is set to “1”.
LAB SETUP…..
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7
Copy the PDS members (“ENQRESP” & “IEFBR14”) into the JCL data set.
ƒGo to ISPF opt 3.3, select “C” copy, and enter “sharc28.nat.jcl” for the “from” data set.
ƒ
ƒEnter your “sharcxx.nat.jcl” for the “to” data set. Hit enter. The member list for
the “from” data set will be displayed.
ƒ Select the two members from “sharc28.nat.jcl” (enter “/” next to each
member). Hit enter, then exit (pf3).
ISGECJES….
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GRS Monitor
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9
//* Distribution Library: ASAMPLIB
//JOBNAME JOB CLASS=A,MSGCLASS=A,TIME=NOLIMIT
//*
//* JOB TO START THE MONITOR
//*
//*
//JOBLIB DD DSN=SYS1.LINKLIB,DISP=SHR
//STEP001 EXEC PGM=ISGAUDIT,PARM='DSP=32'
//*OUTPUT1 DD DSN=USERID.AUDIT.OUT1,DISP=SHR
//*OUTPUT2 DD DSN=USERID.AUDIT.OUT2,DISP=SHR
//OUTPUT1 DD DUMMY
//OUTPUT2 DD DUMMY
//SYSUDUMP DD SYSOUT=*
Data Space (Preferred) vs Dasd Output Data Sets (Informational)
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10
ƒISPF MAIN PANEL CMD LINE - enter 6 (TSO option)
ƒTSO panel – enter ISGACLS0
STARTING THE MONITOR
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11
ENQ/DEQ Monitor - Main Menu
Select an option:
__ 1. MAJOR Names Date & Time : 99.049 09:36
2. Resource Name List Monitor started at : 99.049 09:10
3. Volume List Elapsed seconds : 1557
4. Filter List SMF System ID : SP21
------------------------------------------------------------------------------
GRS Star -> Number of Lock Entries: 1048576 NUMSYS: 2
------------------------------------------------------------------------------
Time of Delay High. . : 99.049 09:32:36
Global Requests . . . : 364 Enqueue Delay Hi - Low: 18241262 1030
Local Requests . . . : 1494 Enqueue Delay mic-sec: 1030
Major Names . . . . . : 29
Minor Names . . . . . : 196
Volumes . . . . . . . : 3 Data Space Used .bytes: 28664 0 %
Number of Events. . . : 3716 Active Filter. . . . .: 08
Lost Events . . . . . : 0 Events Rate . . . . .: 22
Main Menu: Star Mode
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OPTION 1 – MAJOR Names
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13
PFSHOW - If the “pf keys” for the Monitor are not displayed, then on the
cmd line enter “PFSHOW ON”. This will display the “pf keys”.
“PF KEY 6” – (sort_scp) will list resources by the following order of scope
(reserves, global enqs, local enqs).
LOCATE cmd – “L xxxx” can be entered on the cmd line to quickly find a
particular resource name.
Considerations when using the “Major Names” option
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14
EXERCISES
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15
Major name is “SYSDSN”.
The ISPF “Locate cmd” can be used to speed up the search for the data
set.
The ISPF profile data set is “sharcxx.xxx.ISPFPROF”.
Find the “pgm-name” for your ISPF Profile data set.
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16
Which resource has the greatest impact (affecting CPU and performance) for the GRSplex? Hint 1 – It might not always be the resource with the highest resource count. Hint 2 – Reserves have more of an impact on a system than global enqs.
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17
Hint - “*SSYS” is a global enq that has been converted.
Is SPFEDIT being issued as a “Reserve”, “Global Enq”, or both?
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OPTION 3 – Volume List
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19
• Is the SHARE LPAR spreading its “reserves” evenly over its shared DASD volumes?
• What is the “major” and “minor” name of the resource
that is occupying the most reserve time on a volume?
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ISGNQRSP
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21
Create and copy the “sharcxx.nat.loadlib” LOADLIB data set.
ƒSelect “sharc28.nat.loadlib” to pick up the data set attributes.
• Verify that the “record format” field is set to “U”.
ISGNQRSP
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22
Copy the PDS member “GENGRESP” into the LOADLIB data set.
ƒGo to ISPF opt 3.3, select “C” copy, and enter “sharc28.nat.loadlib” for the “from” data set.
ƒ
ƒEnter your “sharcxx.nat.loadlib” for the “to” data set. Hit enter. The member list
for the “from” data set will be displayed.
ƒ Select the “gengresp” member from “sharc28.nat.loadlib” (enter “/” next to the
member). Hit enter, then exit (pf3).
ISGNQRSP
• IBM logo must not
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• Title/subtitle/confidentiality line: 10pt Arial Regular, white Maximum length: 1 line Information separated by vertical strokes, with two spaces on either side
• Slide heading: 28pt Arial Regular, blue R120 | G137 | B251 Maximum length: 2 lines
• Slide body: 18pt Arial Regular, black Square bullet color: teal R045 | G182 | B179 Recommended maximum text length: 5 principal points
• Group name: 14pt Arial Regular, white Maximum length: 1 line
• Copyright: 10pt Arial
Regular, white
Template release: Oct 02
For the latest, go to http://w3.ibm.com/ibm/presentations
Washington Systems Center - ATS
GRS Monitor
Optional slide number:
10pt Arial Bold, white
Indications in green = Live content
Indications in white = Edit in master
Indications in blue = Locked elements
Indications in black = Optional elements
23
Submit the Batch Job.
ƒSet up two screens for ISPF. Place “cursor” at the top of the screen and hit PF2 (split screen). PF9 (swap key) can then be used to switch between screens.
ƒIn either screen, edit the sharcxx.nat.jcl “ENQRESP” member. Change all of the “sharc28” to your “sharcxx” userid.
ƒSubmit the job (enter “sub” on the command line).
ƒ After the job ends, swap screens and edit the “sharcxx.nat.data120” data
set. The results of the “ISGNQRSP” program should be displayed. Scroll right
(pf11) to the end of the data set. The enqueue response performance times
will be shown. The response times are in “usec” (microsecs).
ISGNQRSP
• IBM logo must not
be moved, added
to, or altered in
any way.
• Background should
not be modified.
• Title/subtitle/confidentiality line: 10pt Arial Regular, white Maximum length: 1 line Information separated by vertical strokes, with two spaces on either side
• Slide heading: 28pt Arial Regular, blue R120 | G137 | B251 Maximum length: 2 lines
• Slide body: 18pt Arial Regular, black Square bullet color: teal R045 | G182 | B179 Recommended maximum text length: 5 principal points
• Group name: 14pt Arial Regular, white Maximum length: 1 line
• Copyright: 10pt Arial
Regular, white
Template release: Oct 02
For the latest, go to http://w3.ibm.com/ibm/presentations
Washington Systems Center - ATS
GRS Monitor
Optional slide number:
10pt Arial Bold, white
Indications in green = Live content
Indications in white = Edit in master
Indications in blue = Locked elements
Indications in black = Optional elements
24
ISGECJES
• IBM logo must not
be moved, added
to, or altered in
any way.
• Background should
not be modified.
• Title/subtitle/confidentiality line: 10pt Arial Regular, white Maximum length: 1 line Information separated by vertical strokes, with two spaces on either side
• Slide heading: 28pt Arial Regular, blue R120 | G137 | B251 Maximum length: 2 lines
• Slide body: 18pt Arial Regular, black Square bullet color: teal R045 | G182 | B179 Recommended maximum text length: 5 principal points
• Group name: 14pt Arial Regular, white Maximum length: 1 line
• Copyright: 10pt Arial
Regular, white
Template release: Oct 02
For the latest, go to http://w3.ibm.com/ibm/presentations
Washington Systems Center - ATS
GRS Monitor
Optional slide number:
10pt Arial Bold, white
Indications in green = Live content
Indications in white = Edit in master
Indications in blue = Locked elements
Indications in black = Optional elements
25
Edit the test data set (screen with “sharcxx.nat.data120”).
ƒGo to back to ISPF opt 2 (Edit), and edit “sharcxx.nat.data”.
ƒAdd a line of data to it (anything) and hit enter. Do not exit out.
ƒ Swap to the other screen and go to opt 2 (Edit).
ISGECJES….
• IBM logo must not
be moved, added
to, or altered in
any way.
• Background should
not be modified.
• Title/subtitle/confidentiality line: 10pt Arial Regular, white Maximum length: 1 line Information separated by vertical strokes, with two spaces on either side
• Slide heading: 28pt Arial Regular, blue R120 | G137 | B251 Maximum length: 2 lines
• Slide body: 18pt Arial Regular, black Square bullet color: teal R045 | G182 | B179 Recommended maximum text length: 5 principal points
• Group name: 14pt Arial Regular, white Maximum length: 1 line
• Copyright: 10pt Arial
Regular, white
Template release: Oct 02
For the latest, go to http://w3.ibm.com/ibm/presentations
Washington Systems Center - ATS
GRS Monitor
Optional slide number:
10pt Arial Bold, white
Indications in green = Live content
Indications in white = Edit in master
Indications in blue = Locked elements
Indications in black = Optional elements
26
Submit the Batch Job.
ƒIn the 2nd screen (opt 2), edit the IEFBR14 member in “sharcxx.nat.jcl”. Change all of the “sharc28” to your “sharcxx” userid.
• Hint – On the cmd line, you can enter (f ‘sharc28’ all) to list all of “sharc28” names.
ƒSubmit the job (enter “sub” on the command line).
ƒ The batch job should go into a wait (trying to allocate the “sharcxx.nat.data”
data set which is already allocated in the 1st screen). Keep hitting the “enter”
key every (20-30) seconds to see if the “contention” msgs are issued. They
are issued at certain intervals. After the contention msgs are issued, and while
still in contention, go to the next agenda (Display Cmds).
ISGECJES….
• IBM logo must not
be moved, added
to, or altered in
any way.
• Background should
not be modified.
• Title/subtitle/confidentiality line: 10pt Arial Regular, white Maximum length: 1 line Information separated by vertical strokes, with two spaces on either side
• Slide heading: 28pt Arial Regular, blue R120 | G137 | B251 Maximum length: 2 lines
• Slide body: 18pt Arial Regular, black Square bullet color: teal R045 | G182 | B179 Recommended maximum text length: 5 principal points
• Group name: 14pt Arial Regular, white Maximum length: 1 line
• Copyright: 10pt Arial
Regular, white
Template release: Oct 02
For the latest, go to http://w3.ibm.com/ibm/presentations
Washington Systems Center - ATS
GRS Monitor
Optional slide number:
10pt Arial Bold, white
Indications in green = Live content
Indications in white = Edit in master
Indications in blue = Locked elements
Indications in black = Optional elements
27
GRS – “Display Cmds”
• IBM logo must not
be moved, added
to, or altered in
any way.
• Background should
not be modified.
• Title/subtitle/confidentiality line: 10pt Arial Regular, white Maximum length: 1 line Information separated by vertical strokes, with two spaces on either side
• Slide heading: 28pt Arial Regular, blue R120 | G137 | B251 Maximum length: 2 lines
• Slide body: 18pt Arial Regular, black Square bullet color: teal R045 | G182 | B179 Recommended maximum text length: 5 principal points
• Group name: 14pt Arial Regular, white Maximum length: 1 line
• Copyright: 10pt Arial
Regular, white
Template release: Oct 02
For the latest, go to http://w3.ibm.com/ibm/presentations
Washington Systems Center - ATS
GRS Monitor
Optional slide number:
10pt Arial Bold, white
Indications in green = Live content
Indications in white = Edit in master
Indications in blue = Locked elements
Indications in black = Optional elements
28
Issue the GRS “Display Contention” commands.
ƒ After the contention msgs have been display (1 or 2 intervals), exit out of the “IEFBR14 job” and go to option “s” SDSF. Select opt “ULOG” (it’s okay if it is not in the list of SDSF cmds).
ƒEnter the following “D GRS cmds”, including the “/” (review the results before displaying the next cmd):
•“/D GRS,C” (compare with the newer “D GRS,AN” cmds”)
•“/D GRS,AN,WAIT”.
•“/D GRS,AN,BLOCK”
•“/D GRS,AN,DEP”
.
GRS - “Display Cmds”
• IBM logo must not
be moved, added
to, or altered in
any way.
• Background should
not be modified.
• Title/subtitle/confidentiality line: 10pt Arial Regular, white Maximum length: 1 line Information separated by vertical strokes, with two spaces on either side
• Slide heading: 28pt Arial Regular, blue R120 | G137 | B251 Maximum length: 2 lines
• Slide body: 18pt Arial Regular, black Square bullet color: teal R045 | G182 | B179 Recommended maximum text length: 5 principal points
• Group name: 14pt Arial Regular, white Maximum length: 1 line
• Copyright: 10pt Arial
Regular, white
Template release: Oct 02
For the latest, go to http://w3.ibm.com/ibm/presentations
Washington Systems Center - ATS
GRS Monitor
Optional slide number:
10pt Arial Bold, white
Indications in green = Live content
Indications in white = Edit in master
Indications in blue = Locked elements
Indications in black = Optional elements
29
Release the “sharcxx.test.data” data set.
ƒSwap (pf9) back to the screen containing the “sharcxx.nat.data” data set and exit out (pf3).
ƒThe IEFBR14 job should then complete.
.
GRS - “Display Cmds….”
• IBM logo must not
be moved, added
to, or altered in
any way.
• Background should
not be modified.
• Title/subtitle/confidentiality line: 10pt Arial Regular, white Maximum length: 1 line Information separated by vertical strokes, with two spaces on either side
• Slide heading: 28pt Arial Regular, blue R120 | G137 | B251 Maximum length: 2 lines
• Slide body: 18pt Arial Regular, black Square bullet color: teal R045 | G182 | B179 Recommended maximum text length: 5 principal points
• Group name: 14pt Arial Regular, white Maximum length: 1 line
• Copyright: 10pt Arial
Regular, white
Template release: Oct 02
For the latest, go to http://w3.ibm.com/ibm/presentations
Washington Systems Center - ATS
GRS Monitor
Optional slide number:
10pt Arial Bold, white
Indications in green = Live content
Indications in white = Edit in master
Indications in blue = Locked elements
Indications in black = Optional elements
30
Delete all data sets that were created.
ƒGo to ISPF opt 3.2 and delete (“D”) the data sets.
• “sharcxx.nat.data”.
•“sharcxx.nat.data120”.
•“sharcxx.nat.jcl”.
•“sharcxx.nat.loadlib”
Lab Setup
• IBM logo must not
be moved, added
to, or altered in
any way.
• Background should
not be modified.
• Title/subtitle/confidentiality line: 10pt Arial Regular, white Maximum length: 1 line Information separated by vertical strokes, with two spaces on either side
• Slide heading: 28pt Arial Regular, blue R120 | G137 | B251 Maximum length: 2 lines
• Slide body: 18pt Arial Regular, black Square bullet color: teal R045 | G182 | B179 Recommended maximum text length: 5 principal points
• Group name: 14pt Arial Regular, white Maximum length: 1 line
• Copyright: 10pt Arial
Regular, white
Template release: Oct 02
For the latest, go to http://w3.ibm.com/ibm/presentations
Washington Systems Center - ATS
GRS Monitor
Optional slide number:
10pt Arial Bold, white
Indications in green = Live content
Indications in white = Edit in master
Indications in blue = Locked elements
Indications in black = Optional elements
31
References:
ƒz/OS Planning: Global Resource Serialization
ƒz/OS Initialization and Tuning Reference
ƒz/OS Setting Up a Sysplex
ƒz/OS System Commands
ƒz/OS Installation Exits
Appendix
• IBM logo must not
be moved, added
to, or altered in
any way.
• Background should
not be modified.
• Title/subtitle/confidentiality line: 10pt Arial Regular, white Maximum length: 1 line Information separated by vertical strokes, with two spaces on either side
• Slide heading: 28pt Arial Regular, blue R120 | G137 | B251 Maximum length: 2 lines
• Slide body: 18pt Arial Regular, black Square bullet color: teal R045 | G182 | B179 Recommended maximum text length: 5 principal points
• Group name: 14pt Arial Regular, white Maximum length: 1 line
• Copyright: 10pt Arial
Regular, white
Template release: Oct 02
For the latest, go to http://w3.ibm.com/ibm/presentations
Washington Systems Center - ATS
GRS Monitor
Optional slide number:
10pt Arial Bold, white
Indications in green = Live content
Indications in white = Edit in master
Indications in blue = Locked elements
Indications in black = Optional elements
32
• IBM logo must not
be moved, added
to, or altered in
any way.
• Background should
not be modified.
• Title/subtitle/confidentiality line: 10pt Arial Regular, white Maximum length: 1 line Information separated by vertical strokes, with two spaces on either side
• Slide heading: 28pt Arial Regular, blue R120 | G137 | B251 Maximum length: 2 lines
• Slide body: 18pt Arial Regular, black Square bullet color: teal R045 | G182 | B179 Recommended maximum text length: 5 principal points
• Group name: 14pt Arial Regular, white Maximum length: 1 line
• Copyright: 10pt Arial
Regular, white
Template release: Oct 02
For the latest, go to http://w3.ibm.com/ibm/presentations
Washington Systems Center - ATS
GRS Monitor
Optional slide number:
10pt Arial Bold, white
Indications in green = Live content
Indications in white = Edit in master
Indications in blue = Locked elements
Indications in black = Optional elements
33
Questions